Kill mixedxfermodes
Kill mixedxfermodes

It's too random to be helpful.

BUG=skia:

Review URL: https://codereview.chromium.org/1215703005

todotodoo/skia,Jichao/skia,todotodoo/skia,HalCanary/skia-hc,tmpvar/skia.cc,rubenvb/skia,vanish87/skia,qrealka/skia-hc,rubenvb/skia,HalCanary/skia-hc,HalCanary/skia-hc,tmpvar/skia.cc,todotodoo/skia,nvoron23/skia,pcwalton/skia,Hikari-no-Tenshi/android_external_skia,shahrzadmn/skia,nvoron23/skia,Jichao/skia,pcwalton/skia,Jichao/skia,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,noselhq/skia,Hikari-no-Tenshi/android_external_skia,Jichao/skia,rubenvb/skia,rubenvb/skia,HalCanary/skia-hc,nvoron23/skia,Jichao/skia,tmpvar/skia.cc,pcwalton/skia,aosp-mirror/platform_external_skia,Jichao/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,shahrzadmn/skia,noselhq/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,nvoron23/skia,shahrzadmn/skia,todotodoo/skia,pcwalton/skia,aosp-mirror/platform_external_skia,ominux/skia,rubenvb/skia,shahrzadmn/skia,shahrzadmn/skia,google/skia,pcwalton/skia,aosp-mirror/platform_external_skia,shahrzadmn/skia,pcwalton/skia,Jichao/skia,noselhq/skia,ominux/skia,Jichao/skia,nvoron23/skia,pcwalton/skia,shahrzadmn/skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,ominux/skia,vanish87/skia,qrealka/skia-hc,todotodoo/skia,vanish87/skia,shahrzadmn/skia,shahrzadmn/skia,vanish87/skia,todotodoo/skia,vanish87/skia,Hikari-no-Tenshi/android_external_skia,ominux/skia,vanish87/skia,google/skia,tmpvar/skia.cc,HalCanary/skia-hc,todotodoo/skia,google/skia,nvoron23/skia,noselhq/skia,rubenvb/skia,aosp-mirror/platform_external_skia,todotodoo/skia,HalCanary/skia-hc,qrealka/skia-hc,noselhq/skia,aosp-mirror/platform_external_skia,rubenvb/skia,ominux/skia,tmpvar/skia.cc,tmpvar/skia.cc,Hikari-no-Tenshi/android_external_skia,vanish87/skia,google/skia,pcwalton/skia,noselhq/skia,google/skia,Hikari-no-Tenshi/android_external_skia,ominux/skia,HalCanary/skia-hc,qrealka/skia-hc,vanish87/skia,Jichao/skia,tmpvar/skia.cc,ominux/skia,pcwalton/skia,todotodoo/skia,HalCanary/skia-hc,noselhq/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,vanish87/skia,ominux/skia,qrealka/skia-hc,aosp-mirror/platform_external_skia,qrealka/skia-hc,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,noselhq/skia,tmpvar/skia.cc,nvoron23/skia,rubenvb/skia,nvoron23/skia,nvoron23/skia,aosp-mirror/platform_external_skia,ominux/skia,noselhq/skia,tmpvar/skia.cc,qrealka/skia-hc